Government Actuary's Department is not part of HMT

See:
https://www.gov.uk/api/organisations/government-actuary-s-department

Additionally, it is "HM Treasury", not "Treasury":
https://www.gov.uk/api/organisations/hm-treasury
Whitespace
Correct the parentage of TSOL

TSOL is not a sub-org of HM Treasury, it is a sub-org of Attorney General's
Office.
Fix Bona Vacantia parentage

Bona Vacantia is a sub-org of Treasury Solicitor's Department, not HM Treasury:
https://www.gov.uk/api/organisations/bona-vacantia

Additionally, it is a grandchild of Attorney General's Office, but we don't
have support for grandchildren in the redirector data model.